Răspuns:
8.
840/480 = 84/48 = 21/12 = 7/4
9.
3/5 = 6/10 = 9/15 = 12/20
1.
a)3/7
b)1/7
c)15/19
d)ab/cd
2.
a)5^7•(1+5+25)/5^7•124 = 31/124 = 1/4
c)2^5•(1+2+4)/2^5•77 = 7/77 = 1/11
